Brush



Sept. 2s, 192e.

F.- R. JONES BRUSH Filed Nov. 1v, '.1924

retenes sept. as, leze.

les.

FRANK R. JONES, 0F NORTHBRO, MASSACHUSETTS, ASSIGNOR TO 'NORTI-IBOROBRUSH COMPANY, OF NORTHBORO, MASSACHUSETTS, A COREORATION OF MASSA#cHUsnTTs.

1 BRUSH.

Application led November 17, 1924.. Serial No. I?50,230.

This invention relates to a brush construction capable of general usebut particularly dapted for application to a. tooth brush.

The principal object of the invention is a to provide a solid back toothbrush with a positive means for holding the bristles so that they cannot shed. This is accomplishedaccording to the present invention by theuse of a metallic cup for thevbrist-les 1 0 and the formation of thiscup in a certain Way, as Will appear, to hold them.

i Another object of the invention is to provide a cup of this characterWhich Will not be rusted or otherwise affected by cleansing compositionsthat-are used.

Referencel is tobe had to the accompanyingdravvings in Which o Fig. 1 isaside view of a tooth brush constructed in accordance with thisinvention partly in longitudinal section to shoiv lthe Way the bristlesare held lin place; a y

l? 2 is an enlarged plan view of a small portion of the brush toillustrate the VWay the metal cap appears in the completed brush;

F ig. 3 is an enlarged cross sectional view of the blank of which themetallic cap is formed; and

Fig. 4 is al similar view showing itin its final stage With the bristlestherein.

` In making a'brush according to this invention I bore into the front ofthe solid back and set in a metallic cup for holding the bristles. Ametallic cup is provided Which is not affected by the variousingredients of numerous kinds of tooth paste, powders, and soaps. It isnecessary to provide a Way in which the bristles can be held in such amanner that there is little likelihood of their coming loose.

This invention rela-tes to the manufacture of a high grade brushemploying the best bristles that can be procured. Obviously, there isnot much advantage in using high grade bristles if they will come outafter a short period of use. All the problems that have been mentionedabove therefore had to be solved and the Ways in which they are solvedin this brush cooperate with each to produce a brush which have muchgreater durability than the ordinary brushes on the market. i

Enough has been said to shovv that the brush back 10 which is integralwith the handle and usually formed of Celluloid or similar material isvbored in `from one side part Way through only to forni cavities for thereception of the metal cups Which are to be used. These metal cups areformed as blanks 11 of a general cylindrical form with a closed bottomand with an annular ridge 12'around them at a small distance fromtheopen end. This is spaced from the open end only a short distance. Inorder to avoid the diiii-ulties which other metals Would be subjectedto,` as described above, Irmake this blank of commercial aluminum alloyor other suitable material. This Will stand all thev ingredients Whichhave yet been found in various tooth preparations and even after longuse the surface of the aluminum Will be of the same color and polishthat it had when originally manufactured. There is no deterioration ofthe aluminum on the surface or even lin the `space which receives thebris-V tles that can be detected. This is an imJr portant feature of theinvention. I prefer to use a commercial aluminum Which contains about 96per centaluminum.

This blank 11 is then provided With double over tuft 13 of bristles.Then pressure is applied to the annular ring 12, by a spinningoperation. or bv rotating the blank and rolling a surface thereon topress the blank in or' by pressingy dies. forms an internal ridgeld'ent-irely around the bristles and containing the metal previouslysupplied in the form of the annular ridge 12. The exterior of thefinished cup is nlade cylindrical and smooth, except for minutedepressions 17 and longitudinal fins In this Way the original diameterof the cup is retained atthe mouth. By that I mean that there is aconcave cylindrical Wall 15 for a short distance in from the mouth thatprevents the tufts from flaring too much. In this Way the tufts are heldin approximately parallel condition and Whatd ever tendency they haveHare will be The pressure Si i) a the claims.

checked by the confining action of the mouth of' the cup.

These cups with their bristles are then insorted in the cavities in thebrush blank and pressed into place. Gn account of the properties of thealuminum and celluloid they will bc firmly held in posit-ion and thereis vno danger of their Working loose. The tins 1S, when present. furtherassist in holding them in place. If the cups Were formed of some metalWhich might be affected by acids and alkalies with which they come incontact they might Work out before the bristles.

This furnishes a very durable brush and one in which the back and thefastening of the bristles is sure to last as long as the bristlesthemselves and there can be no shedding of them. Furthermore, no anchoris required in the bottom of the doubled over tufts. It will beunderstood. of course that with this firm manner of securing t-hebristles in the cup, a doubled over tnft of lristles is not absolutely'necessary. If the bristies are set in in one length. they Will also beheld firmly in the space but I prefer to double them. This constitutes avery high class, durable brush that is sanitary and not as expensive asmany other brushes that have been put on the market.

I am aware of the fact that the same principles can be employed forother brushes than tooth brushes and do not Wish to be limited theretoexcegt expressed in thc` claims. Although I hare illustrated anddescribed only a single forni of the inyen` tion, I am aware of the factthat modilica` tions can be made therein by any person skilled in theart Without departing from the scope of the intention as expressed inTherefore I do not Wish to be limited to all the details of constructionherein shown and described, but what I do claim is 1. As an article ofmanufacture, a` brush made up of a back and a series of tufts ofbristles and a cup haring a solid bottom in which each tuft of bristlesset. the opening of each cup being of substantially cylindrical bore andlong enough to hold the lristles substantially straight and parallel atthe circumference of the tuft and prevent flaring, and an inwardlyvextending cireumferential ridge on the inner wall at a distance belov.Ythe rim of the cup for holding the bristles permanently therein, theouter surface of the eng being of approximately uniform sizethroughoutits length.

2. As an article of manufacture, a tuft of bristles and a cup in whichthe tutt of bristles is set, the inner Wall of said cup haring acircumferential ridge at a distance belowI the open end for holding thebristles therein, the outer surface of the cup being cylindrical and ofapproximately uniform diameter, from the open end thereof to and belenvsaid circumferential ridge.

3. The method of making a tuft of bristles which consists in forming ametallic cup of substantially cylindrical bore with a solid bottom andan annular ridge around the cup at a short distance from its open end,inserting a doubled over tuft of bristles into said cup and thenpressing the ridge in- Wardly and uniformly all around until it is flushen the exterior so as to form an internal ridge at a distance from theend for holding the bristles.

In testimony whereof I have hereunto affixed my signature.

FRANK R. IGNES

